diff --git a/src/frontend/Info.ml b/src/frontend/Info.ml
index 09a8125e4..50b9f8cb9 100644
--- a/src/frontend/Info.ml
+++ b/src/frontend/Info.ml
@@ -4,8 +4,8 @@ open Middle
 open Yojson.Basic
 
 let rec unsized_basetype_json t =
-  let to_json (type_, dim) : t =
-    `Assoc [("type", `String type_); ("dimensions", `Int dim)] in
+  let to_json (type_, dim) =
+    [("type", `String type_); ("dimensions", `Int dim)] in
   let internal, dims = UnsizedType.unwind_array_type t in
   match internal with
   | UnsizedType.UInt -> to_json ("int", dims)
@@ -16,13 +16,44 @@ let rec unsized_basetype_json t =
   | UMatrix -> to_json ("real", dims + 2)
   | UComplexMatrix -> to_json ("complex", dims + 2)
   | UTuple internals ->
-      `Assoc
-        [ ("type", `List (List.map ~f:unsized_basetype_json internals))
-        ; ("dimensions", `Int dims) ]
+      [ ( "type"
+        , `List
+            (List.map ~f:(fun t -> `Assoc (unsized_basetype_json t)) internals)
+        ); ("dimensions", `Int dims) ]
   | UMathLibraryFunction | UFun _ | UArray _ -> assert false
 
 let basetype_dims t = SizedType.to_unsized t |> unsized_basetype_json
 
+let rec transformation t =
+  let expr_string = Fmt.to_to_string Pretty_printing.pp_expression in
+  let expr_string e =
+    `String (expr_string (Ast.untyped_expression_of_typed_expression e)) in
+  let transform details = [("constraint", details)] in
+  match t with
+  | Transformation.Identity -> transform (`String "none")
+  | Lower e -> transform @@ `Assoc [("lower", expr_string e)]
+  | Upper e -> transform @@ `Assoc [("upper", expr_string e)]
+  | LowerUpper (e1, e2) ->
+      transform @@ `Assoc [("lower", expr_string e1); ("upper", expr_string e2)]
+  | Offset e -> transform @@ `Assoc [("offset", expr_string e)]
+  | Multiplier e -> transform @@ `Assoc [("multiplier", expr_string e)]
+  | OffsetMultiplier (e1, e2) ->
+      transform
+      @@ `Assoc [("offset", expr_string e1); ("multiplier", expr_string e2)]
+  | Ordered -> transform (`String "ordered")
+  | PositiveOrdered -> transform (`String "positive_ordered")
+  | Simplex -> transform (`String "simplex")
+  | UnitVector -> transform (`String "unit_vector")
+  | SumToZero -> transform (`String "sum_to_zero")
+  | CholeskyCorr -> transform (`String "cholesky_corr")
+  | CholeskyCov -> transform (`String "cholesky_cov")
+  | Correlation -> transform (`String "correlation")
+  | Covariance -> transform (`String "covariance")
+  | StochasticRow -> transform (`String "stochastic_row")
+  | StochasticColumn -> transform (`String "stochastic_column")
+  | TupleTransformation ts ->
+      transform (`List (List.map ~f:(fun t -> `Assoc (transformation t)) ts))
+
 let get_var_decl {stmts; _} : t =
   `Assoc
     (List.fold_right ~init:[]
@@ -30,9 +61,11 @@ let get_var_decl {stmts; _} : t =
          match stmt.Ast.stmt with
          | Ast.VarDecl decl ->
              let type_info = basetype_dims decl.decl_type in
+             let transform_info = transformation decl.transformation in
              let decl_info =
                List.map
-                 ~f:(fun {identifier; _} -> (identifier.name, type_info))
+                 ~f:(fun {identifier; _} ->
+                   (identifier.name, `Assoc (type_info @ transform_info)))
                  decl.variables in
              decl_info @ acc
          | _ -> acc)
diff --git a/test/integration/cli-args/info/info.expected b/test/integration/cli-args/info/info.expected
index 46a805ef6..f5877eb9d 100644
--- a/test/integration/cli-args/info/info.expected
+++ b/test/integration/cli-args/info/info.expected
@@ -1,21 +1,21 @@
   $ ../../../../../install/default/bin/stanc --include-paths=.,includes --info  info.stan
 {
   "inputs": {
-    "a": { "type": "int", "dimensions": 0 },
-    "b": { "type": "real", "dimensions": 0 },
-    "c": { "type": "real", "dimensions": 1 },
-    "d1": { "type": "real", "dimensions": 1 },
-    "d2": { "type": "real", "dimensions": 1 },
-    "e": { "type": "real", "dimensions": 2 },
-    "f": { "type": "int", "dimensions": 1 },
-    "g": { "type": "real", "dimensions": 1 },
-    "h": { "type": "real", "dimensions": 2 },
-    "i": { "type": "real", "dimensions": 3 },
-    "j": { "type": "int", "dimensions": 3 },
-    "cplx": { "type": "complex", "dimensions": 1 },
-    "cplx_vec": { "type": "complex", "dimensions": 1 },
-    "cplx_row": { "type": "complex", "dimensions": 1 },
-    "cplx_mat": { "type": "complex", "dimensions": 2 },
+    "a": { "type": "int", "dimensions": 0, "constraint": "none" },
+    "b": { "type": "real", "dimensions": 0, "constraint": "none" },
+    "c": { "type": "real", "dimensions": 1, "constraint": "none" },
+    "d1": { "type": "real", "dimensions": 1, "constraint": "none" },
+    "d2": { "type": "real", "dimensions": 1, "constraint": "none" },
+    "e": { "type": "real", "dimensions": 2, "constraint": "none" },
+    "f": { "type": "int", "dimensions": 1, "constraint": "none" },
+    "g": { "type": "real", "dimensions": 1, "constraint": "none" },
+    "h": { "type": "real", "dimensions": 2, "constraint": "none" },
+    "i": { "type": "real", "dimensions": 3, "constraint": "none" },
+    "j": { "type": "int", "dimensions": 3, "constraint": "none" },
+    "cplx": { "type": "complex", "dimensions": 1, "constraint": "none" },
+    "cplx_vec": { "type": "complex", "dimensions": 1, "constraint": "none" },
+    "cplx_row": { "type": "complex", "dimensions": 1, "constraint": "none" },
+    "cplx_mat": { "type": "complex", "dimensions": 2, "constraint": "none" },
     "tuples": {
       "type": [
         { "type": "int", "dimensions": 0 },
@@ -28,22 +28,65 @@
           "dimensions": 0
         }
       ],
-      "dimensions": 1
+      "dimensions": 1,
+      "constraint": [
+        { "constraint": "none" },
+        { "constraint": "none" },
+        {
+          "constraint": [
+            { "constraint": "none" }, { "constraint": "none" }
+          ]
+        }
+      ]
     }
   },
   "parameters": {
-    "l": { "type": "real", "dimensions": 1 },
-    "m": { "type": "real", "dimensions": 1 },
-    "n": { "type": "real", "dimensions": 1 },
-    "o": { "type": "real", "dimensions": 1 },
-    "p": { "type": "real", "dimensions": 2 },
-    "q": { "type": "real", "dimensions": 2 },
-    "r": { "type": "real", "dimensions": 2 },
-    "s": { "type": "real", "dimensions": 2 },
-    "y": { "type": "real", "dimensions": 0 }
+    "low": {
+      "type": "real",
+      "dimensions": 0,
+      "constraint": { "lower": "0" }
+    },
+    "l": { "type": "real", "dimensions": 1, "constraint": "simplex" },
+    "m": { "type": "real", "dimensions": 1, "constraint": "unit_vector" },
+    "n": { "type": "real", "dimensions": 1, "constraint": "ordered" },
+    "o": {
+      "type": "real",
+      "dimensions": 1,
+      "constraint": "positive_ordered"
+    },
+    "p": { "type": "real", "dimensions": 2, "constraint": "covariance" },
+    "q": { "type": "real", "dimensions": 2, "constraint": "correlation" },
+    "r": { "type": "real", "dimensions": 2, "constraint": "cholesky_cov" },
+    "s": { "type": "real", "dimensions": 2, "constraint": "cholesky_corr" },
+    "y": { "type": "real", "dimensions": 0, "constraint": "none" },
+    "parameter_transforms": {
+      "type": [
+        { "type": "real", "dimensions": 0 },
+        {
+          "type": [
+            { "type": "real", "dimensions": 1 },
+            { "type": "real", "dimensions": 2 }
+          ],
+          "dimensions": 0
+        }
+      ],
+      "dimensions": 0,
+      "constraint": [
+        { "constraint": { "lower": "y" } },
+        {
+          "constraint": [
+            { "constraint": "simplex" }, { "constraint": "covariance" }
+          ]
+        }
+      ]
+    }
+  },
+  "transformed parameters": {
+    "t": { "type": "real", "dimensions": 2, "constraint": "none" }
+  },
+  "generated quantities": {
+    "u": { "type": "real", "dimensions": 0, "constraint": "none" }
   },
-  "transformed parameters": { "t": { "type": "real", "dimensions": 2 } },
-  "generated quantities": { "u": { "type": "real", "dimensions": 0 } },
   "functions": [
     "fatal_error", "log", "print", "reduce_sum", "reject", "sin", "square"
   ],
diff --git a/test/integration/cli-args/info/info.stan b/test/integration/cli-args/info/info.stan
index f79c568a5..cf2271c87 100644
--- a/test/integration/cli-args/info/info.stan
+++ b/test/integration/cli-args/info/info.stan
@@ -37,6 +37,7 @@ transformed data {
 }
 
 parameters {
+  real <lower=0> low;
   simplex[10] l;
   unit_vector[11] m;
   ordered[12] n;
@@ -46,6 +47,8 @@ parameters {
   cholesky_factor_cov[16] r;
   cholesky_factor_corr[17] s;
   real y;
+
+  tuple(real<lower=y>, tuple(simplex[18], cov_matrix[19])) parameter_transforms;
 }
 
 transformed parameters {